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Featured researches published by Katsuya Otani.


Journal of The Illuminating Engineering Society | 1982

A High Pressure Sodium Lamp with Improved Color Rendition

Katsuya Otani; Kazuo Kawahara; Keiji Watanabe; Michihiro Tsuchihashi

We have developed a new type of retrofit HPS lamp which achieves the improved color rendering properties, general C.R.I. 50–60 with higher luminous efficacy of 105–130 lm/W (220 W-660 W), and can be operated on the conventional mercury lamp ballast by a bimetallic starter unit in the outer bulb. High pressure xenon as a inert gas was effective to obtain the new lamp, lowering total thermal conductivity of the arc. New sealing glass mainly composed of Al2O3 and CaO which had superior stabilities to the high temperature sodium and newly designed electrodes which improved the voltage rise of the lamp during operation were useful to realize this lamp.


Archive | 2006

HIGH-PRESSURE METAL VAPOR DISCHARGE LAMP AND LIGHTING FIXTURE

Seiji Ashida; Shinji Atago; Hisashi Honda; Katsuya Otani; Yoshiko Takahashi; Daisuke Takayama; 勝也 大谷; 慎司 愛宕; 久司 本田; 誠司 芦田; 大輔 高山; 喜子 高橋


Archive | 2005

Metallic vapor discharge lamp and metallic vapor discharge lamp lighting device

Seiji Ashida; Shinji Atago; Makoto Hashimoto; Hisashi Honda; Satoru Iwazawa; Katsuya Otani; Daisuke Takayama; 勝也 大谷; 哲 岩沢; 慎司 愛宕; 久司 本田; 誠 橋本; 誠司 芦田; 大輔 高山


Journal of Light & Visual Environment | 1979

Effects of the polycrystalline alumina arc tube transparency on the efficacy of the high pressure sodium lamps

Katsuya Otani; Ryo Suzuki


Journal of Light & Visual Environment | 1983

The convection phenomena in the high pressure sodium lamp

Katsuya Otani


Journal of The Illuminating Engineering Institute of Japan | 1980

A High Pressure Sodium Lamp with a Improved Color Rendition

Katsuya Otani; Kazuo Kawahara; Ryo Suzuki; Keiji Watanabe; Michihiro Tsuchihashi; Norihiko Tanaka


Journal of Light & Visual Environment | 1980

A high pressure sodium lamp with the improved color rendition

Katsuya Otani; Kazuo Kawahara; Keiji Watanabe; Michihiro Tsuchihashi


Archive | 1999

DISCHARGE LAMP AND MANUFACTURE OF DISCHARGE LAMP

Takayuki Ishigami; Katsuya Otani; Ryo Suzuki; 勝也 大谷; 隆幸 石神; 量 鈴木


Journal of The Illuminating Engineering Institute of Japan | 1981

The Effect of the Xenon Gas on the High Pressure Sodium Arc

Katsuya Otani; Keiji Watanabe; Michihiro Tsuchihashi


Journal of Light & Visual Environment | 1981

The effect of the xenon gas on the high pressure sodium arc.

Katsuya Otani; Keiji Watanabe; Michihiro Tsuchihashi

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